Guitar fret board



FIG. 1 is a front elevational view of a guitar fret board according to my new design;

FIG. 2 is a side elevational view thereof, the opposite side view being a mirror image; and,

FIG. 3 is a front perspective view thereof.

The dashed lines throughout the views form no part of the claimed design. 

The ornamental design for a guitar fret board, as shown and described. 